Then I add an exception for ______. If they cannot tell you their number (happens with some companies), then they can:

- arrange a call, which is great because then I am guaranteed to have the time to deal with the topic, I do that sometimes with my bank;

- leave a voice mail, which is not great but then I am not responsible for their phone number policy (nobody leaves voice mail anymore);

- send an email (or a SMS, a WhatsApp, FB Messenger, Skype, whatever, I am not picky), possibly to arrange a phone call, also great because I can answer written messages on my own terms and not when they feel like calling me;

- (most of the time these days) have a chat over whatever IM platform they integrated into their website.

My time is not theirs to use however they want. If they want me to be on call, that’s fine, but with compensation.